(docs) extend testplan with UI test cases
(docs) extend testplan with UI test cases

gravitational/teleport,yacloud-io/teleport,gravitational/teleport,yacloud-io/teleport,gravitational/teleport,yacloud-io/teleport,yacloud-io/teleport,gravitational/teleport,gravitational/teleport,yacloud-io/teleport,gravitational/teleport,yacloud-io/teleport,yacloud-io/teleport